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tfout.m
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1999-04-29
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# Copyright (C) 1996 A. Scottedward Hodel
#
# This file is part of Octave.
#
# Octave is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version.
#
# Octave is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License
# along with Octave; see the file COPYING. If not, write to the Free
# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
function tfout(num,denom,x)
#
# usage: tfout(num,denom[,x])
#
# print formatted transfer function num(s)/d(s)
# to the screen
# x defaults to the string "s"
#
# SEE ALSO: polyval, polyvalm, poly, roots, conv, deconv, residue,
# filter, polyderv, polyintg, polyout
# Written by A. Scottedward Hodel (scotte@eng.auburn.edu) June 1995)
save_val = implicit_str_to_num_ok;
save_empty = empty_list_elements_ok;
empty_list_elements_ok = implicit_str_to_num_ok = 1;
if (nargin < 2 ) | (nargin > 3) | (nargout != 0 )
usage("tfout(num,denom[,x])");
endif
if ( (!is_vec(num)) | (!is_vec(denom)) )
error("tfout: first two argument must be vectors");
endif
if (nargin == 2)
x = 's';
elseif( ! isstr(x) )
error("tfout: third argument must be a string");
endif
numstring = polyout(num,x);
denomstring = polyout(denom,x);
len = max(length(numstring),length(denomstring));
if(len > 0)
y = strrep(blanks(len)," ","-");
disp(numstring)
disp(y)
disp(denomstring)
else
error('tfout: empty transfer function')
end
implicit_str_to_num_ok = save_val;
empty_list_elements_ok = save_empty;
endfunction